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[EnergyPlus_Support] SolarCollectorFlatPlateWater Warnings

Hello everyone,

In versions before 7.0 i did simulations with solar collectors flat plate water and it all went ok. But, since new versions arrived starting 7.0 problems with warnings started. It is same in 7.1 and 7.2.

Actually, even in example file i have too many warnings about working fluid. For summer months there are about 5000 warnings each month, about overheating or freezing of working fluid. For example:



   ** Warning ** GetSpecificHeatGlycol: Temperature is out of range (too low) for fluid specific heat **
   **   ~~~   ** ..Called From:UpdateSolarCollector Fluid name =WATER,Temperature=-17.30
   **   ~~~   **  Environment=CHICAGO ANN HTG 99% CONDNS DB, at Simulation time=01/21 00:00 - 00:15
   ** Warning ** GetSpecificHeatGlycol: Temperature is out of range (too high) for fluid specific heat **
   **   ~~~   ** ..Called From:UpdateSolarCollector Fluid name =WATER,Temperature=134.81
   **   ~~~   **  Environment=CHICAGO ANN CLG 1% CONDNS DB=>MWB, at Simulation time=07/21 08:45 - 09:00

   ************* ===== Recurring Error Summary =====
   ************* The following recurring error messages occurred.
   *************
   *************  ** Warning ** GetSpecificHeatGlycol: Temperature out of range (too low) for fluid specific heat
   *************  **   ~~~   **   This error occurred 4913 total times;
   *************  **   ~~~   **   during Warmup 0 times;
   *************  **   ~~~   **   during Sizing 0 times.
   *************  **   ~~~   **   Max=-4.065460E-002 {C}  Min=-17.295834 {C}
   *************
   *************  ** Warning ** GetSpecificHeatGlycol: Temperature out of range (too high) for fluid specific heat
   *************  **   ~~~   **   This error occurred 155 total times;
   *************  **   ~~~   **   during Warmup 0 times;
   *************  **   ~~~   **   during Sizing 0 times.
   *************  **   ~~~   **   Max=194.066101 {C}  Min=128.447614 {C}


My question is have someone also had this problem. Is there a solution for this problem like adding valves or something. Thank you in advance. Example file name is SolarCollectorFlatPlateWater.idf.

Regards,
Marko Miletic
Faculty of Engineering in Kragujevac, Serbia



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